JP3101931B2 - Primary radiator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primary radiator for receiving two radio waves whose directions of polarization are mutually orthogonal.

[0002]

2. Description of the Related Art In order to receive the above two radio waves individually,
As shown in FIG. 4, two probes 23f and 24f long in a direction parallel to the directions 9a and 10a of the planes of polarization of those radio waves are attached to the waveguide 21f. The connection between the probe and the circuit board is generally performed by disposing the probe and the circuit board in an orthogonal state. Therefore, as shown in FIG. 4, the mounting portions 43 and 44 are provided on the outer peripheral wall of the waveguide 21f on the respective sides where the probes 23f and 24f protrude, respectively.
Are provided, and the circuit boards 45 and 46 are respectively attached thereto.

[0003]

In this conventional primary radiator, in order to combine and output signals received by both probes, each circuit board 45, 46 attached to each attachment portion is required.
A circuit for receiving signals from the probes 23f and 24f, a circuit board for providing a signal combining means on one of the circuit boards 45, and a circuit provided with the combining means on another connection line 47 from the other board 46. The signal must be transmitted to the substrate 45. However, such signal routing not only complicates the structure, but also the signal has an extremely high frequency, which increases the signal loss or causes interference, so that the routing is extremely sophisticated. Is required, and there is a problem that circuit design is extremely difficult. Also, in the case of assembling, there is a problem that not only the two circuit boards 45 and 46 need to be mounted, but also the connection line 47 needs to be considered in terms of high frequency, and the work is difficult.

The present invention has been made to solve the above-mentioned problems (technical problems) of the prior art, and the mounting portion of the circuit board has an angle of 45 ° with respect to the directions of the polarization planes of the two radio waves. It is an object of the present invention to provide a primary radiator in which a circuit board can be mounted in a direction so that reception from two signals from two probes to synthesis can be performed on one circuit board. .

[0005]

According to the primary radiator of the present invention, an inner peripheral wall of a waveguide having an opening at one end for introducing two radio waves whose respective polarization planes are orthogonal to each other,
One end of each of the two probes long in a direction parallel to the direction of the polarization plane of the two radio waves is provided in a protruding manner, and the other ends of the probes are protruded from the outer peripheral wall of the waveguide, and A circuit board including the other ends of the two probes on the outer peripheral wall of the tube, providing a mounting portion in a plane parallel to the axis of the waveguide, and further including a synthesizing means for synthesizing two signals, It is attached to the mounting part in close contact.

[0006]

When two radio waves whose polarization planes are orthogonal to each other enter the waveguide, each radio wave is individually received by two probes. The received signal is given to the circuit board,
It is synthesized by the synthesizing means there.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. In FIG. 1, reference numeral 1 denotes a support, which stands upright from a foundation 3 buried in the ground 2. Reference numeral 4 denotes a parabolic antenna attached to the support 1, and an offset parabolic antenna is shown as an example. In this antenna 4, reference numeral 5 denotes a reflecting mirror, 6 denotes a supporting arm whose base is attached to the reflecting mirror 5, and 7 denotes a primary radiator with a converter attached to the tip of the supporting arm 6. Reference numeral 8 denotes a communication satellite, and reference numerals 9 and 10 denote vertically polarized and horizontally polarized radio waves transmitted from the satellite, respectively. Next, the primary radiator with converter 7 will be described with reference to FIGS. 11 is a primary radiator, 12 and 13 are circuit boards attached thereto, 14 is a shield case, which is manufactured by die-casting aluminum, and is attached to the primary radiator 11 with a plurality of fixing screws 15. As shown in FIG. 3, the shield case 14 has a plurality of holding portions 14 for holding the circuit board 12 against the primary radiator 11.
a. Reference numerals 16 and 17 denote internal protective covers and caps, and reference numeral 18 denotes terminals.

The primary radiator 11 will be further described.
Reference numeral 21 denotes a waveguide, for example, a waveguide (circular waveguide) having a cylindrical inner peripheral surface made of a metal material having good conductivity such as aluminum. A horn 22 is formed integrally with the waveguide 21. 23 and 24 are probes for receiving vertically polarized radio waves and horizontally polarized waves, respectively. Each of these probes 23 and 24 is formed of a good conductive material, and as shown in FIG. 3, the longitudinal directions thereof are parallel to the directions 9a and 10a of the respective polarization planes of the two radio waves 9 and 10, respectively. It is press-fitted into a through hole 25 formed in the waveguide 21 together with a spacer 26 made of, for example, tetrafluoroethylene resin, and is held and fixed so as to penetrate therethrough. In the two probes 23 and 24, 23a and 24a indicate protruding portions from the inner peripheral wall of the waveguide 21 and are portions for extracting electric signals from radio waves in the waveguide. And a portion for protruding from the outer peripheral wall, and serves as a portion for electrical connection with the circuit board 12. Reference numerals 23c and 24c denote connecting portions for connecting the inner and outer projecting portions to each other.

Reference numeral 27 denotes a circuit board mounting portion provided on the outer peripheral wall of the waveguide 21, which is defined on the side of the protruding portions of the probes 23 and 24, so that the back surface of the circuit board 12 can be attached exactly. It is formed on a flat surface. The direction of the flat surface is clear from FIG.
Both directions are 45 ° with respect to the directions 9a and 10a of the polarization plane. As is apparent from FIG. 2, the mounting portion 27 has a length extending to a part of the outer peripheral wall of the horn 22.

Next, a double-sided printed circuit board is used as the circuit board 12, and various circuits using microstrip lines and circuits formed by electronic components are provided on the surface thereof, and the back surface is provided on the ground surface. Composed of
It is in close contact with the mounting portion 27. Describing the circuit formed on the circuit board 12, 31 and 32 are input terminals,
A through-hole 33 (oval or oblong) penetrating the substrate 12 is provided, and the protruding portions 23b and 24b of the probes 23 and 24 are provided.
Through the through hole 33, and the input terminals 31,
Connected to 32. 34 and 35 are amplifiers, and 36 is a synthesizing means for combining two signals.
A signal combiner that uses the resistor and the resistor 38 to achieve isolation is used. A signal synthesizing unit having another configuration may be used. 39 is a mixer, 40 is a local oscillator, 41
Indicates output terminals. Note that the other circuit board 13 is also formed of a similar printed circuit board, and includes a power supply circuit and an intermediate frequency amplifier circuit.

The operation of the above configuration will be described. When radio waves 9 and 10 of vertically and horizontally polarized waves arrive from the communication satellite 8, those radio waves are reflected by the reflector 5 and reach the primary radiator 7. In the primary radiator 7, the two radio waves 9, 10 enter the waveguide 21 through the horn 22, and the former is received by the probe 23 and the latter is received by the probe 24, respectively. The signals obtained by each of the probes 23 and 24 are input terminals of the circuit board 12.
The signals are fed from amplifiers 31 and 32 to amplifiers 34 and 35, respectively, and after being amplified, they are combined in a signal combiner 36. The synthesized signal is a mixer
At 39, the signal is mixed with the local oscillation signal from the local oscillator 40, and is output from the output terminal 41 as an intermediate frequency signal.
The intermediate frequency signal is amplified by an intermediate frequency amplifier circuit on another circuit board 13 and output from a terminal 18.

[0012]

As described above, according to the present invention, two radio waves 9, 10 whose respective polarization planes 9a, 10a are orthogonal to each other are individually received by the two probes 23, 24, and the signals are received. For synthesizing the circuit board 12 to attach the signal
Not to mention that it can be composed and output at 36,

[0013] be the two waves the two probes 23, 24 are each oriented for receiving of are located 90 degrees different states from each other, the mounting portion 27 of the circuit board 12, the two-
Including the other ends of the two probes 23 and 24, and on the axis of the waveguide
Since they are formed in parallel planes, only one circuit board 12 equipped with the synthesizing means 36 is mounted on the mounting portion 27, and the two probes 2 are mounted on the single circuit board 12.
There is an effect that the two signals received at 3 and 24 can be given to the combining means 36. Moreover, taken above
According to the configuration of the attachment portion 27, the flatness required by the circuit board 12
And a spacious ground plane in the axial direction of the waveguide.
And it can be formed widely. Thus, the present invention
According to the configuration described above, it is possible to eliminate the necessity of taking care of signal routing as in the prior art, and to simplify the circuit design. Further, the assembly of the circuit board 12 is flat.
There is an effect that it can be easily and easily mounted on the mounting portion 27 with only one mechanical mounting.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an installation state of a parabolic antenna.

FIG. 2 is a partially exploded perspective view of a primary radiator with a converter.

FIG. 3 is a longitudinal sectional view of a primary radiator with a converter at a position where a probe is provided.

FIG. 4 is an exploded cross-sectional view of the conventional primary radiator (cross-sectional view at the same position as in FIG. 3).

[Explanation of symbols]

 9, 10 Radio wave 9a, 10a Polarization direction 11 Primary radiator 12 Circuit board 21 Waveguide 23, 24 Probe 27 Mounting part 36 Synthesis means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01P 1/10-1/195 H01P 5/103 H01P 5/107 H01Q 13/02

Claims (1)

(57) [Claims] 1. An inner peripheral wall of a waveguide having an opening at one end for introducing two radio waves whose respective polarization planes are orthogonal to each other is parallel to the direction of the polarization plane of the two radio waves. One end of each of two probes that are long in the direction is provided with a protruding shape, and the other ends of the probes are protruded from the outer peripheral wall of the waveguide .
Mounting part in a plane including the other end and parallel to the axis of the waveguide
And a circuit board having a synthesizing means for synthesizing two signals is mounted on the mounting portion in close contact therewith.